Draw works



March 30,1943. A, R, MNER 2,3 15;157

DRAWWORKS Fild June 14, 1941 2 sheets-sheet 1 March 30, 1943. A. R. MAIER 2,315,157

DBAWWORKS Filed June 14, 1941 2 Sheets-Sheet 2 I 1| E l I l I F I li s: i r we :I l w C@ Il GHF Y I l I I Q I! l l n il I l l l i n Il 2 r l 's E 1| \\Q3 L Q f PIE. :L

[Q7/venan' M6057" E. MAI/5 Patented Mar. 30, 1943 mais? UNITED STATES` PATENT I OFFICE DRAW worms August R. Maier, Oil City, Pa., assignor to Oil Well Supply Company, a. corporation of New Jersey Application `Tune 14, 1941, Serial No. 398,163

1 Claim.

an auxiliary drive for the rotary. However, in;A

the latter case, the rotary is driven from the drum shaft, whereby the drum is inoperative for hoisting purposes. Also, in such auxiliary rotary drives, the entire drawworks including all chain drives and rotating parts except the drum must run during the operation of the rotary, thereby causing unnecessary wear on the drawworks.

This invention contemplates the provision of a unitary drawworks having additional power transmission facilities whereby the hoisting drum and the rotary may be separately driven from the same power source, and also has in View to provide additional transmission and control features to give increased flexibility of transmission for drilling operations. improved construction, it is possible to drive the rotary while the majority of the rotating parts of the drawworks remain inactive, thereby preventing the wearing thereof.

Another object is to provide a drawworks of compact unitary construction to impart maximum portability and economy of construction thereto.

Additional objects and advantages will become apparent from the following description taken in connection with the accompanying drawings, wherein: l

Fig. 1 is a plan view of a drawworks embodying my invention;

Fig. 2 is a side elevational view thereof; and

Fig. 3 is a schematic plan view of the controls for operating the drawworks.

Referring to the drawings, 2, 2 designate skid members secured together and comprising a supporting base.' At one end-of said base is mounted a, prime mover 3, such as an internal' combustion engine or steam engine, disposed with the shaft thereof transversely of the base structure and having a pulley 4 connected to the pulley 5 of a reverse clutch 6 by means of belts 'I, said clutch being mounted on and driving a transverse horizontal jack shaft 8 supported in suitable pedestal bearings 9 on the skids 2, 2.

The clutch 6 is preferably of the friction and planetary gear type, having friction engagement By means of my for one direction of rotation and employing a brake Ill securing the friction parts and permitting reverse rotation of the shaft by the planetary gears, as will be readily understood, said clutch thereby being operable to rotate the shaft 8 in either direction from a unidirectional power application by the engine.

Spaced from jack shaft 8, I provide a pair of side frames or uprights II mounting a transverse horizontal line shaft I2 on the side of the uprights adjacent the jack shaft, and mounting a transverse horizontal drum shaft I3 on the other side thereof, said line and drum shafts being rotatably supported in suitable bearings on the frames II. Shaft I3 carries a drum I fi for the hoisting cable, and line shaft I2 is operatively connected with said drum and jack shafts for power transmission.

Thus, a pair of clutch-controlled sprockets I5 and I6 are rotatable on the jack shaft 8 and are chain connected with sprockets I1 and I8, respectively, on the line shaft I2. The ratios of sprockets I5, I'I'and I6, I8 are such as' to afford Adifferent speeds from the jack shaft to the line shaft, the driving sprockets I5 and I6 being selectively connected with the jack shaft by an intervening slidable coacting clutch member I9 rotatable with said shaft.

Line shaft I2 is provided with sprockets 2! and 2I connected by chains with sprockets 22 and 23, respectively, of the drum shaft I3, the drum shaft sprockets having clutches 24 and 25 respectively, the ratios of sprockets 2U, 22 and 2 I, 23 providing speed changes for the drum shaft I3.

Intermediate the jack and drum shafts, and below the level of the line shaft, I provide a fourth or rotary drive shaft 26 extending transversely of the drawworks and horizontally supported in suitable bearings on the lower portions of the uprights II. Rotary drive shaft 26 is driven from the jack shaft 6, the latter having a pair of sprockets 21 and 28 respectively connected by chains to sprockets 29 and 3l) on the rotary shaft. The ratios of sprockets 2'I, 29 and 28, 30 provide speed changes for the rotary drive shaft 26 through clutches 3I and 32 for selective engagement with the sprockets on the latter shaft.

Sprockets 2'I and 28 comprise a double sprocket loosely mounted onv shaft 8, having a coacting clutch 58 for selectively'c'onnecting the dual sprocket with said shaft. v

Hence, by means of an outboard sprocket 33 on one end of the shaft 26, I have provided an independent drive for a rotary (not shown) by means Conversely, the rotary drive means may be stopped by disengaging clutch 58, and the hoisting mechanism employed for operation of the drum I4, or the rotary and drum shafts may b e operated conjointly, as for example, when it .is desired to use the hoist for auxiliary hoisting purposes during drilling. Also, a cathead 36 on one end of the line shaft I2 may be driven to operate a catline while the rotary is in operation.

it .will be seen that I have provided -a drawworks unit which is :capable of separately or conjointly performing the various `operations attendant upon rotary well drilling, and such ydrawworks, together with the .centralized lcontrols therefore, provides a 'highly .compact and .efficient apparatus.

The controls -for my improved drawworks rare clearly illustrated rin Fig. 3, wherein the shafts, sprockets, .clutches and of the drawworks have been omitted, the shafts being indicated by their center lines only, and the various clutch cleyises Ltelles giver-1 numerals eorrespondius to the numerals o f V.the parts which they operate, but with tlieedded exponent d- All of sei-d ...controls termica-te .adjacent the dr-,iDePs position, indicated by :the .circle at one sideof the unit, and include ,a eombined throttle .end reversing control il. Said control rights Il and piyotally connected Yby linkage 38 Witha vertically disposed lever 39 secured to a rOlS Shdf'l 40 :mounted the base -structure and extending toward the reverse clutch '.6 for 5operative engagement 4with the brake I0 thereof, as indicated at ,4L

`Shaft 40 has a lever .4;2 Yo orlrlected by a link 43 with bell crank 4.4 pivoted at to the base struc# ture, the other arm of bell crank 4,4 being connected by a link 4.6 with a pivoted clevis 6e for actuating the friction portion of the reverse clutch 6. Hence, 'by moving ,the vcontrol 31 to forward lposition F in `Fig. 2, the friction portion of clutch .6 is ,engaged while the brake I0 is'he'ld inactive. In neutral position N, neither the friction means nor the brake are actuated, and in reverse position R, the friction means is released and brake .I0 actuated to permit the planetary action .of the reverse .clutch to drive jack shaft 8 in reverse direction.

Associated with the control 31, I also provide a rod 41 extending therebeyond and connecting the carburetor or valve .of the engine 3.

For the purpose of ydriving the hoisting drum I4 at a selected speed, I rst .dr-ive the line shaft through either the sprockets I5, I1 or sprockets I6, I8, the latter being a high speed and the former a low speed drive. These `drives are controlled by a shift lever 48 secured to a tubular sha-ft 4 9, said shaft being pivotally connected by a link 5u to a second tubular shaft 5I, the latter having a linkage connection 52 with a clevis I9*L for connecting sprockets I5 or I6 with shaft 8 through actuation of clutch member I9.

Telescoping rock shafts 53 and 54 are provided with pedals 55 and 56 for respectively actuating a cluth clevis 25a rotatable with shaft 53, and clutch clevis 24a through linkage 5l connecting the latter clevis and shaft 54. In this manner, pedal 55 provides a reduced speed for the drum shaft I3 from the line shaft I2 through sprockets 2|, 23, and pedal 56 provides for an increased speed through sprockets 20 and 22.

Thus, by manipulating the pedals 55 and 56 and lever 48, it is possible for the operator to obtain four speeds for the drum shaft I3, at any of which speeds the drawworks may be quickly reversed or thrown into neutral bythe clutch con-v trol ;31, providingga high degree of exibility of operation of the apparatus for hoisting purposes.

In order to similarly effect quick and positive control of the rotary drive, I provide a shaft 59 operable :by a pedal GII-to control the operation of the clutch 53 lthrough vconnecting linkage 6I, shaft 62, link `63 and clevis 58a, thereby connecting dual sprocket 21, 28 with the jack shaft 8. A shift lever 64 is connected to a shaft '6,5 telescopin-g within shaft 49, said shaft .$5 terminating in linkage connections 66 for actuating clutch clevises l3l.al and 32e, whereby the Vspeed ofthe rotary drive shaft v26 may be varied by connecting either sprocket 29 or 30 with said shaft.

From the foregoing it will be seen that I have provided a compact unitary apparatus embodying all the essential power transmission facil-ities for rotary drilling operations. By means of my improved drawworks, the driller may conveniently and quickly control the various operations with a high deg-ree of speed variation and prompt reversal of the rotation of the apparatus.

Various ychanges and yn lodications are contemplated Within 'the scope of the following claim.

a dlawworks, the combination with a supporting base, of a jack shaft transversely mounted theleil?, .aptl' of spaced upright side frames secured to the base, a line shaft transversely mounted between said frames on the side thereof adjacent the jack shaft, a .drum shaft mounted transversely between said frames en -.the .other side-thereof from said line shaft, means for ,driving the line shaft directly from the jack shaft including a clutch on the latter, means for driving the drum shaft from the line shaft, a rotary drive shaft mounted transversely between the side frames on the same side thereof as and beneath the line shaft, means for directly .driving the rotary .drive shaft at one of two different speeds from the jack shaft including a clutch driving a-dual sprocket `on the latter shaft, a reverse clutch on the jack shaft, a prime mover mounted transversely on the base adjacent the yjack shaft and driving the latter through said reverse clutch, separate controls connecting each of said clutches mounted on the base and terminating in separate actuating means adjacent the drillers position at the drawworks, thereby DYC- viding selective, independent and reversible drives for the drum and rotary drive shafts from the leek shaft AUGUST R. MAIER. 

